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dual phase lock-in, use the R output to avoid
phase shifts.
The SR552 without a lock-in
The SR552 can be powered with an external
power supply. Power is applied through the 9
pin connector as described below.
Pin Voltage Current
1 +20 V 100 mA
2 +5 V 10 mA
6 -20 V 100 mA
7,8 Ground
All three voltages are required. Pins 7 and 8
should be tied together. All other pins should be
left open. The gain will be 100 in this
configuration. Grounding pin 3 will change the
gain to 50, and grounding pin 4 will change the
gain to 20. Grounding both pins 3 and 4 will
change the gain to 10.